Pro Tips For A Seamless Nuclei Vulnerability Scanner Install: 40 Steps

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If you thought that checking individual vulnerabilities with Nuclei models would be too slow, don’t worry!

How It Works

You can insert multiple models into the Nuclei engine, each of which can identify a different vulnerability. First, the Nuclei engine scans the target application. It then generates results in two simple forms: “Yes” if the vulnerability is detected and “No” if it is not.

But there’s more: Nuclei can be automated for DevSecOps. This means that you can extend the vulnerability scanning to the business flow of the enterprise.

In this example we have “N” number of app versions. After each new release, we can run the full suite of Nuclei models on that release.

Automated core scanning is the next step in taking dynamic testing (DAST) to the next level. As you just saw, Nuclei scans can also be part of a CI/CD pipeline for DevSecOps.

Hacker Tools: Nuclei, A Yaml Based Vulnerability Scanner

Aneesh Bhargav is Head of Content Strategy at . He has experience in creating long-form written content, copywriting, YouTube video production and advertising content. Aneesh has experience working in the application security industry as a writer and marketer and has hosted booths at globally recognized conferences such as Black Hat. He also assisted lead trainer for the sold-out DevSecOps training course at Black Hat An avid reader and learner, Aneesh spends much of his time learning not only about the security industry, but also the global economy, which directly informs his content strategy on . When he’s not creating AppSec-related content, he’s probably playing video games. Nuclei is a new generation of scanners, moving away from the traditional vulnerability scanner model by allowing full extensibility with a very simple and easy-to-use model syntax.

At a basic level, Nuclei is a scanner: it sends HTTP/DNS requests and checks each response for target anomalies. It runs on YAML files that allow users to define the behavior they want in a human-readable format.

Users can easily define matchers that check the response for different types of patterns such as word or regular expression, extractors that extract part of the content from the response using a regular expression. In addition to powerful matching and extraction capabilities, users can fully customize the sent requests, allowing full control over every part of the request/response process.

Instead of combining scanners with vulnerability checks, Nuclei’s approach is to focus on the kernel engine, leaving the task of creating vulnerability checks to the end user.

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The core is designed from the ground up to be highly extensible, so the user can customize everything as needed. Below are the main goals of the Nuclei project:

Project. There is a collection of community-created templates available for the main scanner. These templates come from top users and are carefully curated to eliminate false positives, malicious code, etc. which have been a problem with scanners for a long time.

Currently, 46 people have contributed to the main templates with a total of over 130 templates, some of which were published in a single day by the amazing community.

Nuclei has built-in support for downloading and managing a local copy of the nucleus model repository. Users can simply drive

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To download the repository locally. In case an update is released, the user is notified and can update their copy by running the same command again.

Templates can be run without specifying the full path to the templates. If the user wants to run

. Nuclei will first look for the folder in the current directory, and if the templates are installed locally, it will automatically download it

The scanner supports HTTP and DNS protocols. HTTP requests can be created using declarative YAML or using raw HTTP request functionality. DNS requests can only be defined using the YAML language.

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Matchers can allow you to check whether a string or pattern is found in the response. Extractors allow the user to extract all relevant information from the response as desired by the user.

It is the most powerful matcher that provides a unique expression language that allows the user to match multiple conditions at will, etc.

Currently, extractors are only present for regular expressions. Users can define a regular expression, which will be matched and the matches found will be returned as results. This made it possible to create some really creative templates, including a template for searching HTTP responses for Slack API keys, as well as a template for validating HTTP URLs with usernames and passwords.

A recently added feature is support for workflows which are the conditions and sequence of request execution to make the process more precise. Workflow state support is provided using the tengo project, a small portable language written in Go. A workflow consists of two parts, variables and logic. Variables are the locations for one or more models to run. The second part is the logic that defines how the variables should be executed.

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Using this syntax allows users to gain precise control over the scanning process without having to deal with false positives or slow scans.

Which is complete SSRF in Jira. A successful use of CVE returns the content of the target URL found on the page. The following payload reveals the exploit:

To identify this vulnerability, all we need to do is make a request to the following URL and find a static page that returns a unique string that can report the discovery. We can use a hack and try to request https://ipinfo.io/json which always returns a fixed word

It requests the following URL and checks if the response contains the word mentioned above. So simple!

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Taking fingerprints is one of the most important parts of any work process. Having an idea of ​​what the target is doing can allow the hacker to decide how to proceed with the target.

Nuclei makes it easy to write models to discover applications running on a target. You can create technology-specific templates to discover an application, which can even go as far as discovering installed versions. As soon as